File system object methods can be used to
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perform any OS operations
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perform any script activities
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perform any file system related activities
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No such object supported in Quick Test
The File System Object (FSO) provides methods specifically for file system operations like creating, deleting, copying, and moving files and folders. It does not perform arbitrary OS operations (option A), all script activities (option B), and it is definitely supported in Quick Test Professional (option D is false).
The FileSystemObject (FSO) in VBScript/QTP exposes methods and properties specifically for working with the file system — creating, reading, moving, and deleting files and folders, checking drive info, and similar tasks. It isn't a general-purpose OS automation or scripting object; its scope is limited to file-system-related operations, which is why that option is the accurate description.